[lworld] RFR: 8374913: [lworld] UnProblemList three tests due to JDK-8372341

[Daniel D. Daugherty]

A trivial fix to UnProblemList three tests due to JDK-8372341.

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Commit messages:
 - 8374913: [lworld] UnProblemList three tests due to JDK-8372341

Changes: https://git.openjdk.org/valhalla/pull/1880/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1880&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8374913
  Stats: 3 lines in 1 file changed: 0 ins; 3 del; 0 mod
  Patch: https://git.openjdk.org/valhalla/pull/1880.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1880/head:pull/1880

PR: https://git.openjdk.org/valhalla/pull/1880